package com.xuecheng.media.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.xuecheng.media.model.po.MediaProcess;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

/**
 * <p>
 *  Mapper 接口
 * </p>
 *
 * @author itcast
 */
@Mapper
public interface MediaProcessMapper extends BaseMapper<MediaProcess> {

    /**
     * 查询待处理任务
     * @param shardTotal 分片总数
     * @param shardIndex 分片序号
     * @param count 失败次数
     * @return
     */
    @Select("select * from xcplus_media.media_process t where t.id % #{shardTotal} = #{shardIndex} and (t.status = 1 or t.status = 3) and t.fail_count < 3 limit #{count}")
    List<MediaProcess> selectListByShardIndex(@Param("shardTotal") int shardTotal, @Param("shardIndex") int shardIndex, @Param("count") int count);

    /**
     * 开启任务
     * @param id
     * @return
     */
    @Update("update xcplus_media.media_process m set m.status = '4' where (m.status = '1' or m.status = '3') and m.fail_count < 3 and m.id = #{id}")
    int startTask(@Param("id") long id);
}
